To be specific, it isn't an Arduino brand, it is a DigiSpark, but the trouble isn't with the device itself. The problem is with a buzzer ... this circuit to drive a relay (like if you want ...

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used ...

Once the timer countdown reaches 0 seconds, the PIEZO-BUZZER (BZ1) will bang on and the LCD display will blink “TIMER ALERT!”. An optional RELAY driver output is available at pin 4 of the Arduino ...